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怎么生成22位的时间戳

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Release： 2016-06-13 13:26:47
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如何生成22位的时间戳？

PHP code
<!--

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-->echo number_format(microtime(true),12,'','');
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我用这种方法，发现最后的4~6位总在几个数之间变动，不知道为什么？

------解决方案--------------------
为啥要22位的呀？有什么业务需求？
------解决方案--------------------
12位小数的意思，时间在变它怎么会不变啊。
------解决方案--------------------
microtime 的最小分辨率是“微秒”，如果你觉得最后几位连续性太差，就表示的机器比较慢
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